JPH09245949A - Induction heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating cooker in which a center part and a peripheral part of a container can also be heated to high temperature in a short time as well as a middle part. SOLUTION: A container 1 such as a baking plate comprising ferrite metal is placed on an upper surface of a plate 2 comprising glass ceramic or the like, a coil plate 5 is provided under the plate 2, and a heat-resistant litz wire is wound above the coil plate 5 to form integrated two-layer coils 4 comprising an upper layer coil 4a and a lower layer Coil 4b. An outer diameter of the lower layer coil 4b is set to be similar to a bottom diameter of the container 1, a winding number of the upper layer coil 4a is set to be 40-100% to the lower layer coil 4b, and an insulation layer 9 is provided between the upper layer coil 4a and the lower layer coil 4b, thereby a piece of meat can be baked in a short time at uniform high temperature by high frequency induction heating to perform cooking of a steak or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating cooker suitable for commercial use, which is capable of cooking steak or the like at high temperature in a short time by using high frequency induction heating.

[0002]

2. Description of the Related Art In a conventional induction heating cooker, FIG.
As shown in the temperature distribution diagram of the conventional induction heating cooker container, the electromagnetic field is most concentrated in the middle part of the cross section of the coil for high-frequency induction heating, and the temperature of the middle part of the container such as roasted meat plate becomes high. There is no coil in the center, the electromagnetic field is weak, and the temperature rise in the center of the container tends to be slow. When the container is heated, the temperature of the coil center rises slowly, the temperature is low, and the temperature becomes uneven. Therefore, in order to make the surface temperature of the container uniform, for example, in Japanese Utility Model Publication No. 57-34693, the middle part of the coil where the temperature of the container is highest is arranged one step lower than the inner peripheral part and the outer peripheral part. No. 136787, the temperature of the container of another conventional induction heating cooker shown in FIG. 4 is made by flattening the coil winding pitch by flattening the stranded wire forming the coil near the middle of the coil where the temperature of the container is highest. As shown in the distribution chart, there is one in which the container temperature is made uniform by lowering the temperature of the intermediate portion of the coil.

[0003]

Generally, a steak or the like cooked at a high temperature in a short time needs to have the surface of the meat evenly baked in about 2 minutes. However, in the aforementioned conventional induction heating cooker, in which the temperature of the container is made uniform, the temperature of the middle part of the coil for high frequency induction heating is lowered, and the center of the coil has no coil and the electromagnetic field is weak and the temperature rises. However, there is a problem that the temperature is low and the temperature rises slowly when steaks are required to rise to a high temperature and in a short time.

Further, as disclosed in Japanese Patent Laid-Open No. 62-136993, a conductive plate having a heat-resistant insulator formed by forming a coil for high frequency induction heating in a spiral shape so that a copper foil is roughened toward a central portion. In some cases, a container and a heat-resistant insulating sheet are integrated alternately to form a laminated type, and the container is heated to a uniform temperature. However, if the impedance of one conductive plate is low and many sheets must be stacked, the number of parts will increase. However, there is a problem in that many processes and assembling steps are required.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and in an induction heating cooker for cooking steak or the like by high frequency induction heating, a plate made of glass ceramics or the like is provided on the upper surface of the plate. Place a container such as a roasted meat plate made of ferritic metal, provide a coil plate under the plate, wind a heat resistant litz wire on the coil plate to form an integrated two-layer coil consisting of an upper coil and a lower coil. The outer diameter of this lower coil is approximately the same as the bottom diameter of the container, the number of turns of the upper coil is 40 to 100% of that of the lower coil, and an insulating layer is provided between the upper coil and the lower coil. It should be possible to cook grilled steaks at high temperature in a short time.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A lower coil having an outer diameter substantially the same as the diameter of the bottom of a container having a simple structure as described above heats the outer peripheral portion of the container well, and has the same outer diameter as that of the lower coil. The upper coil formed with a small number of turns heats the center of the container to raise the temperature as much as possible, and at the same time, high output can be obtained, so it is suitable for cooking steak etc. for commercial use. The outer circumference and the outer circumference are at the same high temperature (290 ° C) for a short time (eg 90
Within a second), it will be heated uniformly. The best effect is obtained when the number of turns of the upper coil is set to be about one half of the outer diameter of the lower coil.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an essential part of an induction heating cooker to which an embodiment of the present invention is applied, and FIG. 2 is a temperature distribution diagram of a container of the induction heating cooker.

In the figure, reference numeral 1 is a container made of a ferritic metal (for example, iron casting, 430 series stainless steel, etc.) and has a large plate thickness of about 10 mm for baking steaks and the like. Reference numeral 2 is a glass-ceramic plate that is not affected by electromagnetic fields, has heat resistance of 400 ° C., and has mechanical strength that can be used without problems such as damage even if the metal container 1 is used roughly. It is what

A litz wire 3 is a heat resistant electric wire, which is wound around a coil plate 5 to form a coil 4. The coil 4 has an integral two-layer structure and is composed of an upper layer coil 4a and a lower layer coil 4b, and an insulating layer 9 having heat resistance such as a mica plate is provided between the coils 4a and 4b to insulate the coils. I keep it. Upper coil 4a and lower coil 4
b are wound in the same direction, and the lower coil 4b has an outer diameter substantially the same as the diameter of the bottom of the container 1 so that the outside of the container 1 is well heated. Formed with a small number of turns (40 to 100%), 2
It is manufactured by connecting one end of each coil with a connection terminal and integrating them.

Reference numeral 6 is a ferrite attached to the bottom of the coil plate 5 for shielding electromagnetic waves. 7 is 20
It is an inverter that generates a high frequency of up to 25 KHz and performs induction heating. Reference numeral 8 denotes a temperature sensor that detects the temperature of the container 1 through the glass-ceramic plate 2 and performs a safe operation such as overheating prevention.

The operation of this embodiment will be described below.

The container 1 is placed on the plate 2, and a high frequency current is caused to flow in the coil 4 by the inverter 7 to generate a high frequency magnetic flux, and an eddy current is generated in the container 1 above the coil 4, and the container heat is generated by the Joule heat. 1 heating is performed.

In the conventional one-layer coil, as shown in FIG. 3 described above, the temperature of the intermediate portion of the coil is the highest, whereas the lower coil 4b having an outer diameter substantially the same as the diameter of the bottom of the container 1 is used. The outer peripheral portion of the container 1 is heated well, and the lower coil 4
Upper layer coil 4 formed with the same or smaller number of turns as the outer diameter of b
Since a is heated so as to raise the temperature of the central portion of the container 1 as much as possible, the central portion and the outer peripheral portion of the container are heated to the same extent as the intermediate portion as shown in the temperature distribution diagram of the container shown in FIG. The best effect is when the number of turns of the upper coil 4a is set to be about one half of the outer diameter of the lower coil 4b.

Therefore, since a high output can be obtained with a simple structure, for commercial use, for example, the container 1 after receiving an order.
Is placed on the plate 2 and is induction-heated by the coil 4 having an integral two-layer structure, so that the container 1 is heated to a predetermined high temperature in a short time without waiting for the customer, and then meat for steak or the like. You can place the food to be cooked, turn it over when one side has the desired baking quality, add vegetables and other supplements, and carry the sizzling steak to your table. As a result, the surface of the meat is evenly baked at a high temperature (for example, 290 ° C.) in a short time (for example, within 90 seconds), and the inside can cook a delicious delicious steak.

[0015]

According to the present invention, a container such as a roasted meat plate made of ferrite metal is placed on the upper surface of a plate made of glass ceramics, a coil plate is provided at the bottom of the plate, and a heat-resistant material is placed on the coil plate. A litz wire is wound to form an integral two-layer coil composed of an upper coil and a lower coil. The outer diameter of the lower coil is approximately the same as the bottom diameter of the container, and the upper coil has 40 to 100 turns.
%, And an insulating layer is provided between the upper coil and the lower coil, so the temperature is high (for example, 290 ° C.) despite the simple structure.
Since it is heated uniformly in a short time and high output is obtained, the surface of the meat is quickly baked within 90 seconds, and the inside can cook delicious tasty steak.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an induction heating cooker according to an embodiment of the present invention.

FIG. 2 is a temperature distribution diagram of a container of the induction heating cooker.

FIG. 3 is a temperature distribution diagram of a container of an induction heating cooker showing a conventional example.

FIG. 4 is a temperature distribution diagram of a container of an induction heating cooker showing another conventional example.

[Explanation of symbols]

 1 Container 2 Plate 4 Coil 4a Upper Layer Coil 4b Lower Layer Coil 5 Coil Plate 9 Insulating Layer

Claims (1)

[Claims] 1. An induction heating cooker which cooks meat such as steak by high frequency induction heating at high temperature in a short time, and a grilled meat plate made of ferrite metal on the upper surface of a plate (2) made of glass ceramics or the like. The container (1) is placed, the coil plate (5) is provided under the plate (2), and a heat resistant litz wire is wound on the coil plate (5) to form an upper coil (4a) and a lower coil (4b). Forming an integral two-layer coil (4) consisting of
The outer diameter of the lower coil (4b) is approximately the same as the bottom diameter of the container (1), and the number of turns of the upper coil (4a) is lower.
The induction heating cooker is characterized in that it is 40 to 100% of b), and further an insulating layer (9) is provided between the upper coil (4a) and the lower coil (4b).